ArcGis For Flex 之 QueryTask地理坐标展现【原创】

　　本功能仿照Google Map分类搜索做的，可以看Google效果：http://ditu.google.cn/maps?hl=zh-CN&tab=wl

 

现在说说从查询到画出标注的具体经过，贴代码，注释写的也不多，有兴趣深究的可以到官方API查询

下面的代码是查询，并画出标注：

/**************************** 地标-地理定位数字化展现***************************/ public function ReaderLandMark(landMarkSearchWhere:String):void {clearAllGraphicsLayers();queryUrl=sLandMarkUrl + "/0";query.where=landMarkSearchWhere;query.outFields=new Array('NID', 'CNAME', 'CTYPE', 'CPROVINCE', 'CCITIES', 'CCOUNTY', 'CROAD', 'CHOUSENUM', 'NLON', 'NLAT');queryTaskGsm.execute(query, new AsyncResponder(onResult, onFault));function onResult(featureSet:FeatureSet, token:Object=null):void{glLandMark.clear(); //清空图层var displayFieldName:String=featureSet.displayFieldName;var count:int=1;var arrColl:ArrayCollection;var txtSysmbol:TextSymbol;var compSysmbol:CompositeSymbol;var tFormat:TextFormat=new TextFormat();tFormat.bold=false;tFormat.size=10;tFormat.font="Verdana";for each (var myGraphic:Graphic in featureSet.features){arrColl=new ArrayCollection();txtSysmbol=new TextSymbol(count.toString(), null, 0x070707);txtSysmbol.textFormat=tFormat;arrColl.addItem(new SimpleMarkerSymbol(SimpleMarkerSymbol.STYLE_CIRCLE, 20, 0xFE776B));arrColl.addItem(txtSysmbol);compSysmbol=new CompositeSymbol();compSysmbol.symbols=arrColl;myGraphic.toolTip=myGraphic.attributes.CNAME;myGraphic.symbol=compSysmbol;glLandMark.add(myGraphic);count++;}}function onFault(info:Object, token:Object=null):void{Alert.show(info.toString(), "Query Problem");} }

然后是datagrid的行单击，实现标注的高亮特效，还是比较炫的哦，代码如下：

//datagrid 单击protected function dgClick(e:MouseEvent):void{var itemR:DataGridItemRenderer=e.target as DataGridItemRenderer;if (!itemR){return;}var pt:MapPoint=new MapPoint(itemR.data.NLON, itemR.data.NLAT);if (!parentApplication.Map.extent.contains(pt)){parentApplication.Map.centerAt(pt);}var pictureMarker:PictureMarkerSymbol=new PictureMarkerSymbol("assets/flash/Red_glow.swf", 40, 40, -11, 10);var myGraphic:Graphic=new Graphic(pt, pictureMarker);myGraphic.name="ghTopicByLandMark";var removeGraphic:Graphic=parentApplication.glLandMark.getChildByName("ghTopicByLandMark");if (removeGraphic){parentApplication.glLandMark.remove(removeGraphic);}parentApplication.glLandMark.add(myGraphic);}

OK,完成了。。。。。。。。。。。。有错误和有待优化的地方请留言指正！

作者：董广祥
转载请说明出处：http://www.cnblogs.com/myssh/archive/2010/06/01/1748983.html

转载于:https://www.cnblogs.com/myssh/archive/2010/06/01/1748983.html

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